SH7730 Datasheet, PDF (588/1188 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7780 Series

Section 17 Realtime Clock (RTC)
Initial
Bit
Bit Name Value
7
PEF
0
6 to 4 PES[2:0] 000
3
RTCEN 1
2
ADJ
0
R/W Description
R/W Periodic Interrupt Flag
Indicates interrupt generation with the period
designated by the PES[2:0] bits. When set to 1, PEF
generates periodic interrupts.
0: Interrupts not generated with the period designated
by bits PES[2:0].
[Clearing condition]
When 0 is written to PEF
1: Interrupts generated with the period designated by
bits PES[2:0].
[Setting condition]
When an interrupt is generated with the period
designated by bits PES[2:0] or when 1 is written to the
PEF flag
R/W Interrupt Enable Flags
These bits specify the periodic interrupt.
000: No periodic interrupts generated
001: Periodic interrupt generated every 1/256 second
010: Periodic interrupt generated every 1/64 second
011: Periodic interrupt generated every 1/16 second
100: Periodic interrupt generated every 1/4 second
101: Periodic interrupt generated every 1/2 second
110: Periodic interrupt generated every 1 second
111: Periodic interrupt generated every 2 seconds
R/W Crystal Oscillator Control
Controls the operation of the crystal oscillator for the
RTC.
0: Halts the crystal oscillator for the RTC.
1: Runs the crystal oscillator for the RTC.
R/W 30-Second Adjustment
When 1 is written to the ADJ bit, times of 29 seconds or
less will be rounded to 00 seconds and 30 seconds or
more to 1 minute. The divider circuit (RTC prescaler
and R64CNT) will be simultaneously reset. This bit
always reads 0.
0: Runs normally.
1: 30-second adjustment.
Rev. 1.00 Sep. 19, 2007 Page 540 of 1136
REJ09B0359-0100